JPH03121993A - Electric propeller propulsion device - Google Patents

Abstract

PURPOSE:To simplify mechanism by providing a coil at a fixed shaft fitted outboard, the supporting an outer cylinder for covering the coil rotatably at the fixed shaft through a seal and thrust bearings, and fitting a propeller on the outer cylinder, thereby rotating the propeller by the magnetic induction of a current flowing in the coil. CONSTITUTION:A fixed shaft 2 fitted outboard a ship 1 is provided with a coil 3 for generating a rotating field. An outer cylinder 4 is rotatably supported at the fixed shaft through a seal and thrust bearings 5 in such a way as to envelop the coil 3. A propulsion propeller 6 is fitted at the periphery of the outer cylinder 4. When power is supplied to the coil 3 through a power device in the ship 1, an alternating current flows to the coil 3, and a rotating field is generated around the coil 3 by magnetic induction. Subsequently, the outer cylinder 4 and thereby the propeller 6 are rotated. A power transmission shaft, a gear, and the like are not therefore required, nor is seal for the shaft and inside a hull required, thus simplifying an installation place and structure.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a propeller propulsion device for ships.

[Conventional technology]

In a conventional propeller propulsion device, a propeller is rotationally driven from a prime mover such as an engine inside a ship via a power transmission shaft. In some cases, the power transmission shaft is directly connected to the prime mover,
In some cases, it passes through conductive elements such as gears. The stern portion of the power transmission shaft is sealed.

[Problem to be solved by the invention]

However, in the conventional propeller propulsion system configured as described above, there are two limitations: ■ Because mechanical elements such as power transmission shafts and gears are interposed in the middle, there are restrictions on where the prime mover such as the engine can be installed inside the ship. Because the power transmission shaft passes through the hull at the stern, it takes some effort to prevent seal friction, wear, and water leaks; ■ It takes time and effort to install and adjust the power transmission shaft; ■ The power transmission shaft When measuring transmission shaft horsepower, there are problems such as the need for a special signal input/output device such as a slip ring because the shaft rotates.

The present invention aims to solve the above-mentioned problems and provide a propeller propulsion device that eliminates a power transmission path such as the power transmission shaft of the conventional device and in which the shaft supporting the propeller does not rotate.

[Failure to solve the problem]

According to the present invention, the above object is achieved by: a fixed shaft outside the boat is provided with a winding for generating a rotating magnetic field;
An outer cylinder is provided on the outside of the winding, and is rotatably supported between the winding and the fixed shaft via a seal and a thrust bearing, and is rotationally driven by magnetic induction of the current flowing through the winding. This is achieved by: a propeller being attached to the outer cylinder;

[Effect]

In the present invention, a rotating magnetic field is generated when an alternating current is passed through the winding. Then, the outer cylinder, which has a propeller and is rotatably supported on a fixed shaft, rotates following the rotating magnetic field. In other words, unlike conventional devices, the propeller does not use a power transmission shaft (it rotates).In addition, the fixed shaft that supports the outer cylinder to which the propeller is attached can be structured so that no seal is required between it and the hull. Furthermore, since it does not rotate, horsepower can be measured without using a slip ring or the like.

〔Example] Hereinafter, the present invention will be described in detail based on the accompanying drawings.

Figure 1 (8) is a longitudinal sectional view of the device of this embodiment, Figure 1 (B)
is a sectional view taken along line B--B in FIG. 1(A).

In the figure, reference numeral 1 denotes an outer plate of the stern part of the hull, and a fixed shaft 2 is provided outside the ship, passing through the stern part. Since the fixed shaft 1 does not rotate, it may be completely sealed between it and the stern portion without providing a seal portion that allows rotation. Further, the fixed shaft does not need to be constructed so as to pass through the stern of the ship, but may simply be replaced on the outer shell outside the ship.

The fixed shaft 2 is provided with a winding 3 for generating a rotating magnetic field. A power supply line 7 is connected to the winding 3 to receive alternating power from a current device P inside the ship, as shown in FIGS. 2, 3, and 4.

The power supply device P is driven by an engine or the like to generate electricity.

An outer cylinder 4 is rotatably supported on the fixed shaft 2 via a seal and a thrust bearing 5 so as to surround the winding 3. A propeller 6 for propulsion is attached to the outer periphery of the outer cylinder 4. In this embodiment, the outer cylinder is made of laminated silicon steel plates, has an end ring provided at the end, and is covered with an insulating material on the outside.

In the device of this embodiment, the winding is connected to the power supply device P inside the ship.
When power is received from the winding 3, an alternating current flows through the winding 3, and a rotating magnetic field is generated around the winding 3 due to magnetic induction. Then, the outer cylinder 4 rotates following the rotating magnetic field. That is,
The propeller 6 attached to the outer cylinder 4 receives rotational drive. The propulsive force generated by the rotation of the propeller 6 is transmitted to the fixed shaft 2 via the thrust bearing 5, thereby propelling the ship.

In addition, rotational horsepower is directly measured from the reaction force of the fixed shaft.

〔Effect of the invention〕

As described above, according to the present invention, the configuration does not use a power transmission shaft or gears, so the installation location of the prime mover such as the power source engine can be freely selected, and the various work that occurs during the installation can be done easily. The shaft does not penetrate the ship's hull, so there is no need to worry about water leaking into the ship, horsepower can be directly measured from the reaction force of the fixed shaft, and the vibration and noise caused by the transmission shaft This has the effect of eliminating

[Brief explanation of drawings]

FIG. 1(A) is a vertical sectional view of an apparatus according to an embodiment of the present invention.
Figure (B) is a sectional view taken along the line BB in Figure 1 (8), and Figures 2 to 4 are schematic diagrams illustrating different examples of the positional relationship between the power supply device and the propeller propulsion device.

Claims (1)

[Claims] A winding for generating a rotating magnetic field is installed on the fixed shaft outside the ship.
An outer cylinder is provided on the outside of the winding, and is rotatably supported between the winding and the fixed shaft via a seal and a thrust bearing, and is rotationally driven by magnetic induction of the current flowing through the winding. An electric propeller propulsion device, wherein the outer cylinder is provided with a propeller.